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# NSEJS 2018-19 Question Paper With Answer Keys And Solutions

Hi students, welcome to **AmansMathsBlogs (AMB)**. On this article, you will get **NSEJS 2018-19 Question Paper With Answer Keys And Solutions**.

**NSEJS 2018-19** is an IJSO Stage 1 exam that is conducted by IAPT (Indian Association of Physics Teacher). In 2018-19 session, NSEJS is conducted on 18 November 2018 (Sunday).

These questions are solved by me, AMAN RAJ, I am maths faculty of IIT Maths Foundation course and founder of this website **AmansMathsBlogs (AMB)**.

## NSEJS 2018-19 Question Paper Code JS511

## NSEJS 2018-19 Answer Keys

PHYSICS NSEJS 2018-19 Answer Keys | |||||||
---|---|---|---|---|---|---|---|

Ques No | Ans Key | Ques No | Ans Key | Ques No | Ans Key | Ques No | Ans Key |

1 |
B |
6 |
C |
11 |
B |
16 |
B |

2 |
A |
7 |
B |
12 |
B |
17 |
B |

3 |
D |
8 |
B |
13 |
B |
18 |
B |

4 |
C |
9 |
C |
14 |
A |
19 |
B |

5 |
A |
10 |
A |
15 |
C |
20 |
C |

CHEMISTRY NSEJS 2018-19 Answer Keys | |||||||

Ques No | Ans Key | Ques No | Ans Key | Ques No | Ans Key | Ques No | Ans Key |

21 |
D |
26 |
D |
31 |
A |
36 |
C |

22 |
B |
27 |
C |
32 |
A |
37 |
D |

23 |
C |
28 |
D |
33 |
A |
38 |
A |

24 |
A |
29 |
B |
34 |
A |
39 |
C |

25 |
C |
30 |
B |
35 |
A |
40 |
C |

MATHEMATICS NSEJS 2018-19 Answer Keys | |||||||

Ques No | Ans Key | Ques No | Ans Key | Ques No | Ans Key | Ques No | Ans Key |

41 |
C |
46 |
C, D |
51 |
A |
56 |
B |

42 |
D |
47 |
NA |
52 |
C |
57 |
NA |

43 |
D |
48 |
B |
53 |
C |
58 |
A |

44 |
C, D |
49 |
B |
54 |
A |
59 |
D |

45 |
A |
50 |
B |
55 |
B |
60 |
D |

BIOLOGY NSEJS 2018-19 Answer Keys | |||||||

Ques No | Ans Key | Ques No | Ans Key | Ques No | Ans Key | Ques No | Ans Key |

61 |
A |
66 |
D |
71 |
B |
76 |
B |

62 |
B |
67 |
C |
72 |
A |
77 |
D |

63 |
B |
68 |
D |
73 |
C |
78 |
B |

64 |
A |
69 |
C |
74 |
C |
79 |
A |

65 |
D |
70 |
A |
75 |
A |
80 |
A |

## NSEJS 2018-19 Solutions MATHS

**NSEJS 2018-19 Maths Questions Bank With Solutions: Ques No 41**

Let AB be a diameter of a circle C_{1} of radius 30 cm and with centre O. Two circles C_{2} and C_{3} of radii 15 cm and 10 cm touch internally at A and B respectively. A fourth circle C4 touches C_{1}, C_{2} and C_{3}. What is the largest possible radius of C_{4}?

**Options:**

A. 12 cm

B. 15 cm

C. 20 cm

D. 30 cm

**Answer Key: C**

**Solution:**

**NSEJS 2018-19 Maths Questions Bank With Solutions: Ques No 42**

A 5×5×5 cube is built using unit cubes. How many different cuboids (that differ in at least one-unit cube) can be formed using the same number of unit cubes?

**Options:**

A. 1000

B. 1728

C. 2730

D. 3375

**Answer Key: D**

**Solution:**

**NSEJS 2018-19 Maths Questions Bank With Solutions: Ques No 43**

What is the largest value of the positive integer k such that k divides n^{2}(n^{2} – 1)(n^{2} – n – 2) for every natural number n?

**Options:**

A. 6

B. 12

C. 24

D. 48

**Answer Key: D**

**Solution:**

**NSEJS 2018-19 Maths Questions Bank With Solutions: Ques No 44**

A person kept rolling a regular (six faced) die until one of the numbers appeared third time on the top. This happened in 12^{th} throw and the sum of all the numbers in 12 throws was 46. Which number appeared least number of times?

**Options:**

A. 6

B. 4

C. 2

D. 1

**Answer Key: C, D**

**Solution:**

**NSEJS 2018-19 Maths Questions Bank With Solutions: Ques No 45**

In a square ABCD, a point P is inside the square such that ABP is an equilateral triangle. The segment AP cuts the diagonal BD in E. Suppose AE = 2. The area of ABCD is

**Options:**

A. 4 + 2Root(3)

B. 5 + 2Root(3)

C. 4 + 4Root(3)

D. 5 + 4Root(3)

**Answer Key: A**

**Solution:**

**NSEJS 2018-19 Maths Questions Bank With Solutions: Ques No 46**

Let n be a positive integer not divisible by 6. Suppose n has positive divisors. The number of positive divisors of 9n is

**Options:**

A. 54

B. 36

C. 18

D. 12

**Answer Key: C**

**Solution:**

**NSEJS 2018-19 Maths Questions Bank With Solutions: Ques No 47**

The value of

, when x = 2ab/(b^{2} + 1) is:

**Options:**

A. a

B. b

C. x

D. 0

**Answer Key: BONUS as wrong print in x = 2a/(b ^{2} + 1)**

**Solution:**

**NSEJS 2018-19 Maths Questions Bank With Solutions: Ques No 48**

Two regular polygons of different number of sides are taken. In one of them, its sides are colored red and diagonals are colored green. In other, the sides are colored green and diagonals are colored red. Suppose there are 103 red lines and 80 green lines. The total number of sides the two polygons together have is:

**Options:**

A. 23

B. 28

C. 33

D. 38

**Answer Key: B**

**Solution:**

**NSEJS 2018-19 Maths Questions Bank With Solutions: Ques No 49**

A box contains some red and some yellow balls. If one red ball is removed, one seventh of the remaining balls would be red. If one yellow ball is removed, one-sixth of the remaining balls would be red. If n denotes the total number of balls in the box, then the sum of the digits of n is:

**Options:**

A. 6

B. 7

C. 8

D. 9

**Answer Key: B**

**NSEJS 2018-19 Maths Questions Bank With Solutions: Ques No 50**

Let ABCD be a rectangle. Let X and Y be points respectively on AB and CD such that AX:XB = 1:2 = CY:YD. Join AY and CX. Let BY intersect CX in K. Let DX intersect AY in L. If m/n denotes the ratio of the area of XKYL to that of the ABCD, then (m + n) is

**Options:**

A. 9

B. 11

C. 13

D. 15

**Answer Key: B**

**Solution:**

**NSEJS 2018-19 Maths Questions Bank With Solutions: Ques No 51**

Let ABC be an equilateral triangle. The bisector of ∠BAC meets the circumcircle of ABC in D. Suppose DB + DC = 4. The diameter of the circumcircle of ABC is

**Options:**

A. 4

B. 3Root(3)

C. 2Root(3)

D. 2

**Answer Key: A**

**Solution:**

**NSEJS 2018-19 Maths Questions Bank With Solutions: Ques No 52**

Let T_{k} denote the k^{th} term of an arithmetic progression. Suppose there are positive integers m ≠ n such that T_{m} = 1/n and T_{n} = 1/m. Then T_{mn} is

**Options:**

A. 1/mn

B. 1/m + 1/n

C. 1

D. 0

**Answer Key: C**

**Solution:**

**NSEJS 2018-19 Maths Questions Bank With Solutions: Ques No 53**

In a triangle ABC, let AD be the median from A. Let E be a point on AD such that AE:ED = 1:2 and let BE extended meets AC in F. The ratio of AF/FC is

**Options:**

A. 1/6

B. 1/5

C. 1/4

D. 1/3

**Answer Key: C**

**Solution:**

**NSEJS 2018-19 Maths Questions Bank With Solutions: Ques No 54**

If sinθ and cosθ are roots of the equation px^{2} + qx + r = 0, then

**Options:**

A. p^{2} – q^{2} + 2pr = 0

B. (p + r)^{2} = q^{2} – r^{2}

C. p^{2} + q^{2} – 2pr = 0

D. (p – r)^{2} = q^{2} + r^{2}

**Answer Key: A**

**Solution:**

**NSEJS 2018-19 Maths Questions Bank With Solutions: Ques No 55**

For a regular k-sided polygon, let a(k) denotes its interior angle. Suppose n > 4 is such that a(n – 2), a(n), a(n + 3) forms an arithmetic progression. The sum of digits of n is

**Options:**

A. 2

B. 3

C. 4

D. 5

**Answer Key: B**

**Solution:**

**NSEJS 2018-19 Maths Questions Bank With Solutions: Ques No 56**

The sum of 5 numbers in geometric progression is 24. The sum of their reciprocals is 6. The product of the terms of the geometric progression is

**Options:**

A. 36

B. 32

C. 24

D. 18

**Answer Key: B**

**Solution:**

**NSEJS 2018-19 Maths Questions Bank With Solutions: Ques No 57**

Digits a and b are such that the product 4a1 and 25b is divisible by 36 (in base 10). The number of ordered pairs (a, b) is

**Options:**

A. 15

B. 8

C. 6

D. 4

**Answer Key: NA**

**Solution:**

**NSEJS 2018-19 Maths Questions Bank With Solutions: Ques No 58**

The integer closest to , where there are 2018 ones and 1009 twos, is

**Options:**

A. (10^{1009} – 1)/3

B. (10^{1009} – 1)/9

C. (10^{2018} – 1)/3

D. (10^{2018} – 1)/9

**Answer Key: A**

**Solution:**

**NSEJS 2018-19 Maths Questions Bank With Solutions: Ques No 59**

In a triangle ABC, a point D on AB is such that AD:AB = 1:4 and DE is parallel to BC with E on AC. Let M and N be the mid-points of DE and BC respectively. What is the ratio of the area of the quadrilateral BNMD to that of the triangle ABC?

**Options:**

A. 1/4

B. 9/32

C. 7/32

D. 15/32

**Answer Key: D**

**Solution:**

**NSEJS 2018-19 Maths Questions Bank With Solutions: Ques No 60**

The number of distinct integers in the collection [10^{2}/1], [10^{2}/2], [10^{2}/3], [10^{2}/4], …, [10^{2}/20]

**Options:**

A. 20

B. 18

C. 17

D. 15

**Answer Key: D**

**Solution:**

**Click Here To Download NSEJS 2018-19 Answer Keys With Solutions As PDF**